Nirvana wasn't a grunge band, they were a riot grrl punk band, people just didn't notice because they were dudes.

The sound fits- intentionally "sloppy"/gritty northwestern US punk-

the lyrics fit- they focus on empowerment, sexual assault, racism, classism, patriarchy...

Kurts visual style fits (right down to the thrift store cardigans and dresses)..

Nirvana is a partly gender swapped Bikini Kill.